CVE-2026-55205
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk22th percentile — higher than 22% of all known CVEs
Summary
Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads.
Risk Assessment
Attackers can send repeated or concurrent requests to exhaust server memory and thread resources, potentially triggering repeated outbound device-code requests to upstream OAuth providers.
Recommendation
It is recommended to update Hermes WebUI to version 0.51.468 or later to mitigate this vulnerability and to monitor traffic to the endpoint for potential attacks.
Original NVD description (English source)
Hermes WebUI before 0.51.468 contains a resource exhaustion vulnerability in the unauthenticated POST /api/onboarding/oauth/start endpoint that allows unbounded accumulation of in-memory flow state and daemon threads. Attackers can send repeated or concurrent requests to exhaust server memory and thread resources, potentially triggering repeated outbound device-code requests to upstream OAuth providers.